xrdp is an open source RDP server. xrdp versions prior to 0.10.0 have a vulnerability that allows attackers to make an infinite number of login attempts. The number of max login attempts is supposed to be limited by a configuration parameter `MaxLoginRetry` in `/etc/xrdp/sesman.ini`. However, this mechanism was not effectively working. As a result, xrdp allows an infinite number of login attempts.

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4166 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4166-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                          Abhijith PA     May 16, 2025                                  https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : xrdp     Version        : 0.9.21.1-1~deb11u2     CVE ID         : CVE-2023-40184 CVE-2023-42822 CVE-2024-39917

    Several vulnerabilities were discovered in xrdp, a Remote Desktop     Protocol (RDP) server


    CVE-2023-40184

        improper handling of session establishment errors allows bypassing         OS-level session restrictions. The `auth_start_session` function         can return non-zero on PAM error which may result in in session         restrictions such as max concurrent sessions per user by PAM.

    CVE-2023-42822

        Access to the font glyphs in xrdp_painter.c is not bounds-checked         . Since some of this data is controllable by the user, this can         result in an out-of-bounds read within the xrdp executable. The         vulnerability allows an out-of-bounds read within a potentially         privileged process.

    CVE-2024-39917

        a vulnerability that allows attackers to make an infinite number         of login attempts. The number of max login attempts is supposed to         be limited by a configuration parameter `MaxLoginRetry` in         `/etc/xrdp/sesman.ini`. However, this mechanism was not         effectively working. As a result, xrdp allows an infinite number         of login attempts.

    For Debian 11 bullseye, these problems have been fixed in version     0.9.21.1-1~deb11u2.

    We recommend that you upgrade your xrdp packages.

    For the detailed security status of xrdp please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/xrdp

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - xrdp is an open source RDP server. xrdp versions prior to 0.10.0 have a vulnerability that allows     attackers to make an infinite number of login attempts. The number of max login attempts is supposed to be     limited by a configuration parameter `MaxLoginRetry` in `/etc/xrdp/sesman.ini`. However, this mechanism     was not effectively working. As a result, xrdp allows an infinite number of login attempts.
    (CVE-2024-39917)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2025:0350-1 advisory.

    - CVE-2024-39917: Enforce no login screen if require_credentials is set (bsc#1227769)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
236872	Debian dla-4166 : xrdp - security update	Nessus	Debian Local Security Checks	critical
228542	Linux Distros Unpatched Vulnerability : CVE-2024-39917	Nessus	Misc.	critical
215171	SUSE SLES15 Security Update : xrdp (SUSE-SU-2025:0350-1)	Nessus	SuSE Local Security Checks	critical

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CVE-2024-39917

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